Can I downgrade firmware without access to my cfw?

I annoyingly updated to 19.0.0 earlier because it wouldn't let me use my new sd card without. I've been banging my head against the wall as to why I was getting error messages and all, does anyone know if I can downgrade without being on atmosphere or at lease when the next update should be out? Haven't used my switch for a few weeks because I didn't have enough storage so im a bit passed off to say the least. Cheers guys